Re: hp8640B_CR17_CR20_Hot
|
Armin,
From my notes: almost a quarter of a century ago I had a similar failure. Just replaced the power diodes (3A) and all went fine. The A/B23 go to SS 23: the -5.2 V regulator. Let me know if you need more info. Good luck, 73 de
Harke
On Friday, April 17, 2020, 12:41:20 PM GMT+2, Armin Roesch <armin.roesch@...> wrote:
Main Fuse blown.
Fuse replaced >> ON >> generator shows frequency and level correct.
After 10 seconds smells very strange.
>> OFF
It smells that C6 22nf (parallel main filter output) became faulty.
>> Removed
>> ON
All voltages seems to be correct.
>> Then smoke from the rectifier board
>> OFF
Remove rectifier board.
CR17 fall of the board!
CR20 looks like it was very hot
No idea where output A/B 23 is for? Did not found the goal of that voltage.
Any idea?
Thanks for hints.
Armin
HB9MFL
|
